Centrifugal machine



May l2, 1936. D. PERRIER GENTRIFUGAL MACHINE Filed Oct. 15, 1931 Patented May 12, 1936 UNITED STATES 'PATENT lori-lcs CENTRIFUGAL MACHINE Daniel Perrier, Unieux (Loire), France, assigner' of one-hall.' to Socit Anonyme Franaise Said: Anciens` Etablissements Cime, Paris,

`Appumnm october 15, 1951, serial' No. 569,053 In France December 9, 1930 2 Claims. (Cl. 233-46) walls and the inner wall of the bowl or between their outer walls and the inner wall of the casing by which they are surrounded, passages, of which the section is adjustable from the outside, for the heavy impurities, the purified material and the light impurities.

2. The adjustment of the section of the passages referred to in paragraph 1 is effected by a separate and longitudinal movement from the top downwardly of the circular partitions in the rotary bowl, the said circular partitions being shaped in such a manner that their downward movement brings their lower circular edge more deeply into the layer of centrifuged materials and` thus increases the quantity of materials A. which they separate from the said layer.

3. The materials separated by the lower edges of the circular partitions are conducted, by means of suitable passages, to discharge collectors.

4. In certain forms of construction of the invention there is solely effected the removal of the lighter impuritiesand the pulp, the heavier impurities being retained in the bowl. 'Ihe removal of the lighter impurities is effected by means of a circular trough movable vertically in another stationary annular trough, the two communicating with one another, Whilst the second also communicates with a collecting channel by means of suitable fittings.

In the prior art machines the impurities remain in the rotary bowl which necessitates stoppingthe machine periodically for the purpose of cleaning it. Serious consequences may result from this in connection with the products in the course of manufacture if this cleaning is forgotten. This necessity of stopping also involves a loss of time each time of stopping.

Centrifugal machines constructed in accordance with Vthe invention enable these disadvantages to be overcome not only because they permit of a continuous iiow of the purified pulp, but

also because the removal is continuous both of .the heavy impurities and of the lighter impurities.

In the accompanying drawing:-

Figure 1 illustrates by way of example the upper portion of a centrifugal machine constructed in accordance with the invention, in which there is provided a device for the continuous removal ofthe light impurities, this device not being combined with a continuous removal of the heavy impurities. In this form of construction there is consequently only provided a single casing which is movable vertically and moves in a second capacity integral with the bowl. Passages for the continuous removal of light impurities formed integral with the stationary casing are provided. The movable casing communicates with the stationary casing by openings provided in its upper wall and the stationary casing communicates in turn with the outflow passages by means of openings provided in its upper wall.

Figure 2 is a partial plan of the machine illustrated in Figure 1, and

,Figure 3 is a partial section on the line 3 3 of Figure 2, this figure showing by way of example one of the shapes which may be imparted to the passages for the continuous removal of light impurities, these passages being secured to the upper wall of the stationary casing.

Figures 1-3 relate to a form of construction of theinvention in which the separation is eiected by movable partitions, but there is only effected the separation of the purified material and the light impurities.

As shown in Figure 1 of the drawing the apparatus is only provided with a single partition 21 which is movable vertically, the vertical movements of the partition being capable of being effected by actuation of screw threaded rods 28 of which the screw threaded portion engages with screw threaded lugs 29 on the movable partition.

In this case the movable partition 21 is guided on the outside by the vertical wall oi a casing 30 which is longitudinally stationary and with which it communicates by openings 3|.

The casing 30 which forms a collector for the light impurities is provided with tubular members 32 which conduct these impurities into a passage 33 from which they can be discharged by a tubular member 34.

On examination of the drawing it will be seen that when moving the movable partition 21 downwardly or upwardly the section of the passage 3i for the purified materials is reduced or increased at the same time as the thickness of the layer of impurities in the centrifuged layer is increased or reduced.

The puried material passes through the passage 35 and the passage 36 into the collector 37 the bowl under the action of centrifugal force,

to which it is subjected, separates itself in the order of density into heavy impurities which are deposited and remain on the wall of the rotary bowl by reason of the provision of a projecting ring 39 which prevents their passage, into purified material which leaves the bowl in the direction of the arrow 40 and into light impurities which enter the casing and which are discharged therefrom by members 32 into the stationary collector 33.

As shown in Figure 3 the members 32 may be provided at the end of inclined portions so as to facilitate the outflow of light impurities along the path indicated by the arrows 4l), the direction of rotation of the machine being indicated by the arrow 4|.

The method of construction of the invention illustrated in- Figures 1-3 thus shows the application of two partitions of which one is movable longitudinally in the other, these two partitions communicating with one another for the continuous outflow of light impurities. This method of construction is applicable for the removal of heavy impurities and of the main purified material to be recovered, either of the devices shown, both in the first form of construction and in the second being capable of being constructed separately or jointly with one of the''t'hers or jointly with the two others, the four possible combinations being within the scope of the invention. It will be understood that as regards the nature of the various members which are shown in the accompanying drawing and as regards the means of connecting these various members together, modifications may be applied to machines constructed in accordance with the invention without modifying the features thereof.

I claim:-

1. In a centrifugal separator, the combination with a rotary bowl of a partition arranged concentrically in the upper end of said rotary bowl, a casing of flxed height in the upper end of said rotary bowl and connected to the latter so as to rotate therewith, said partition being axially movable in said casing, means for adjusting said partition in said casing in an axial direction, an annular ange on the interior wall of 'said bowl adjacent the lower end of said partition, projecting radially and interiorly of the bowl, tangents to said partition and to said flange forming an angle therebetween, said iiange being adapted to prevent the outflow of the heavier material separated in said separator, means of communication between the interior of said partition and said casing, separated material of medium density passing through a space formed between said partition and said flange, and material of light density passing through the interior of said partition into said casing, the angular relation of the partition with respect to the ange causing movement of the partition to result in change in the cross-section of said space.

2. In a centrifugal separatorthe combination with a rotary bowl of a partition arranged concentrically in the upper end of said rotary bowl, a casing of fixed height inle upper end of said rotary bowl and connected to the latter, so as to rotate therewith, said partition being axially movable in said casing, means for adjusting said partition in said casing in an axial direction, an annular ange on the interior wall of said bowl adjacent the lower end of said partition,

projecting radially and interiorly of the bowl,

tangents to said partition and to said ange forming an angle therebetween, said iiange being adapted to prevent the outflow of the heavier.

material separated in said separator, means of communication between the interior of said partition and said casing, separated material of medium density passing through a space formed between said partition and said ange, and material of light density passing through the interior of said partition into said casing, the angular relation of the partition with respect to the flange causing movement of the partition to result in change in the cross-section of said space, and means for collecting the material from the space between said partition and said ange and from said casing. Y

DANIEL PERRIER. 

